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<?php $items = array(10, 20); $udiff = array_udiff($items, $items, function ($a, $b) { $result = $a === $b; print("Comparing $a to $b, result is $result\n"); return $result; }); var_dump($udiff);
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Comparing 10 to 20, result is Deprecated: array_udiff(): Returning bool from comparison function is deprecated, return an integer less than, equal to, or greater than zero in /in/n8os0 on line 6 Comparing 20 to 10, result is Comparing 10 to 20, result is Comparing 20 to 10, result is Comparing 10 to 10, result is 1 Comparing 10 to 20, result is Comparing 20 to 10, result is Comparing 10 to 20, result is Comparing 20 to 10, result is array(0) { }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28
Comparing 10 to 20, result is Deprecated: array_udiff(): Returning bool from comparison function is deprecated, return an integer less than, equal to, or greater than zero in /in/n8os0 on line 10 Comparing 20 to 10, result is Comparing 10 to 20, result is Comparing 20 to 10, result is Comparing 10 to 10, result is 1 Comparing 10 to 20, result is Comparing 20 to 10, result is Comparing 10 to 20, result is Comparing 20 to 10, result is array(0) { }
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Comparing 10 to 20, result is Comparing 10 to 20, result is Comparing 10 to 10, result is 1 Comparing 10 to 20, result is Comparing 10 to 20, result is array(0) { }
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28
Comparing 20 to 10, result is Comparing 20 to 10, result is Comparing 20 to 20, result is 1 Comparing 20 to 10, result is Comparing 20 to 10, result is array(0) { }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/n8os0 on line 6
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/n8os0 on line 6
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/n8os0 on line 6
Process exited with code 255.
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